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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5b8885766206912674d7bf4774c5a45d2d5a8cba3d6b016b88cee7939b2283' 
  AND token = 'q38Hc55g5uZU95amRmUKKsMMlLa70KQW/ly3EQJlWek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}